Articulated connecting rod



Jan. 3, 1928.

G. D. ANGLE ARTICULATED coNNEcTING Ron Filed Feb. 23, 1926 Patented'Jan. 3i, 1928i i UNITED! STATES' Gilman n. ANGLE, or nnrnor'r, MICHIGAN.

AnrrcuLA'rnn coimc'rING non.`r

Y Application ined rebrualy 23, 1926. 'serial No. 90,146.

The invention relates to engin-es and refers more 'particularly to a' connectingrod construction. of thearticulated type, suchas areused in V', W,-or radial 'type engines.

.. The articulated type of connecting rodis frequently 'employed inl engines in which more "thanone cylinder` operates about aV ingleY crank-pin., It consists of almaster.

rod having a full bearing upon the crankpin to which are hinged the required number of link connecting rods for the'other cylinders located in that planeiof'rotation. The

path ofthe `lower or crank-pin ends of the link rods is of no simple geometric shape,

due to the fact that these oscillate upon pins connectingthem tolthe master rod. The disadvantages accrufng from this ',motion,

which naturally causes these pistons to travell differently yfrom the one attached to the master rod, is more than compensated forby the excellent conditions provided for a bearing on. the crank-pin. This L.latter becomes particularly noticeable inl enginesof relatively large .piston displacement; vthat is,

' when compared to the other constructions known as the forked (or straddle) type and the slipper typey rods.

The construction forming the subject matter of this invention'has to do with attaching or hinging the Alink rod to the master. One type of construction often employed is to fork .the master rod, supporting and locking the pin in theforked ends and having the eyeor bossV of the link rod bear upon the pin between the. forked ends. This -construction usuallyy involves an expensive and none too mechanically satisfactory method of locking, besides involving an excessive amount.. of machine work on the master rod in producing the fork. y 7

'Another type. of construction which i's generally considered a morevpractical and less expensive one, is to fork the ends of the link rods land support and lock the pin inthe eye or boss provided on the master rod. There. are two disadvantages conimonly experienced in prior constructions of this type which are'eliminated by my -invention. These disadvantages are as folllowszvFirst, the forks on the link rods can rarely befmade light land yet sufficiently rigid to prevent seriousv deflection under"l Y heavy loads; second, the pin must be assembled without scoring the surfaces and ysince it must be a tight ht in the boss on the master rod, it follows that the latter must be split and clamped after` the pin-isl inA place.-Naturally-it is rather difficulty to maintain a round hole for 'fully sup-fy porting the pin ein the split boss of the `master rod during Vall ofthe manufacturing processes.

:My the link rod-that itcannot deflect under load and it kdoes not require a saw slot in the boss on t-he master rod that supports-the-pin. In assembling my construction there is also no possibility of scoring thebearingsur faces of the pin.

Vith these and invention resides in` the novell features of construction and combination4 and arrangements of yparts asmore fully hereinafter described and claimed.

`Referring'to the drawings in which like reference characters indicate corresponding parts:v i'.

Figure 1 is Yan end elevation view of the master rod with the connecting 'rod links secured theretolin accordance with myin-V vention; Y

Figure 2f isa detail view partly in section along line 2-2 of Figure'l; and

Figure line 3-3`of Figure 1. f .f l f In the drawings referencev character A represents-themaster rod having a. bearing y upon the usual-crank-pin-(not shown).

The master rod may-comprise upper an lower sections 11 vand "12" Vrespectively clamped together by bolts-124 in accordancey One of vthese sec- .tions-may be formed with bosses'13, bored toreceive they bushings v14 whi'cn may have outwardly flanged-endsas shown in Figure 2. V15 represents the link connecting rods with customary design.

forked att-heir lower ends to provide spaced bearings 16K and 17 for the pin 18.

invention so holds the forked-ends of' other objects in view, the-` 3 is a detail-sectional Vviewv alongv sol ter pin isstepped A'n diameter as at 19, 20 f and and locked in' one. of the forks of the link rod as hereinafter described.'V Thevv steppedopo'rtions 19 .and 2()y engage :in ,thelforks y16 and 17 respectively w ile the int termediate portion 2Oa vforms a journal `free to oscillatefiny the fboss. 13. Endwise defiecvtion cannot occur because the 'forked vends,l of the link rod are held? against vvthe shoulders formed by the ends of bushing 14. v The pins 18 consequently oscillate with the end of each link rod and bear in the eyes, or bores of the master rod, which are provided with suitable bushings 14. In kassembly there is the link rod may be employed; however, that shown is preferred because so few parts lare-required with no unnecessary projections. To this end a slot 22 is provided in the small 4end 20 of the pin 18 to receive the end of a set screw 23 threaded into atapped hole on one side of the fork of the link rod 15. A convenient means for locking the, set screw is by a soft iron washer 211 navi-ngV an extension 25 turned'up against one of Vthe sides on the head of the screw 23 and also having another extension 26 which is adapted to be turned down into one of the peripheral slots 27 in the nut 28. This nutis threaded in the end 20 of pin 18 and is flanged outwardly to hold the pin 18 endwise in the link rod. If desired, th-e other end of pin 18 may be expandedras at 19a to further assist in preventing endwise movement of the pin.

While it is believed that lfrom the for going description, the nature and advantage of my invention will be readily understood, I desirev to have it understood that Ido not limit myself to what is herein shown and described and that suchV changes may be resorted to when desired as fall within the scope .of the claims. I

`What I claim as my invention is 2^- 1. An larticulated connectingfrod assem bly comprising a master rod having avinain crank-pin bearing, said master rod being formed with a boss, 'a link connecting .rod having an end forked to 'receive said boss, a pin forminga connection between theboss and the forked end of the link rod, said pin being 'stepped to provide threel portions thereof'of different diameters, two of said stepped portions being engaged respectively in the saifd forked ends of the link rod and the third step port-ion foiming a journal in the said boss, and means securing the pin to the link rod to prevent endwise and rotational movement of the pin with respect to the vlink rod including a member threadedly engaging the small end of said pin.

2L An articulatedV connecting rod assembly comprising a master rod having a main crank pin bearing7 said master rod being formed with a boss, a link connecting rod having an end forked to receive said boss,

a pin forming a connection between the boss `and the forked end of the linkV rod, and

means for preventing relative. rotational movement of the pin with respect to the link rod including a headed element threadedly engaging the link rod and having'a portion thereof projecting into a slot formed in one end of the pin.

3). An articulated connecting rod' assem# bly compiising a master rod hav-inga maincrank pin bearing, said master rod being v formed with a boss, link connecting rod having` an end forked to receive said boss,"

a pin forming a connection between the boss and forked end of the link rod, said pin be'- ing stepped to provide end portions'tliereof of different diameters engageablerespecfV tively in said forked ends of the rod, and

means for holdingthe pin end-wise in the link rod including a member .threadedly engaging said pin and havin-g a portion engaging` the forked end of said rod.

t. An articulated connecting rod asseni# bly comprising a master rod having a'main crank pin bearing, said master Irod being formed with a boss, a link `connecting rod.

having an end forked to receive said boss, a pin forming a connection between the Vboss and the forked. end of the link rodf, saidpin being stepped to provide end portions there-y 5. An articulated connecting yrod lass'enibly comprising a master connecting rod,

having a main crank pin bearing, said mas. j

ter rod being. formed with 'a boss, a link connecting rod, aV pin forming a connection between the boss and link rod, `said pin'being stepped in diameter to provide-bearings of different diameter between the bossand link rod,ineans for securing the pin to the link rod to prevent yend-wise movement thereof including a member threadedly engaging saidpin having a peripheral Vliange provided with a plurality of 'peripherally arranged slots and a ymember carried b i s i Y said forked .end engageable .in the slots aforesaid for preventing rotative movement of the pin with respect-to the link rod. y

In testimony whereofI affix my signature.

` GLENN D. ANGLE. 

